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Security and privacy in RFID systems is an important and active research area. A number of challenges arise due to the extremely limited computational, storage and communication abilities of a typical RFID tag. This paper describes two families of simple, inexpensive, and untraceable identification protocols for RFID tags. The proposed protocols involve minimal interaction between a tag and a reader and place low computational burden on the tag, requiring only a pseudo-random generator. They also impose low computational load on the back-end server.
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